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• When I restart my LXC environment, the container does not re-bind to the IP address

  - by RoboTamer

  The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route add -net 127.0.0.0 netmask 255.0.0.0 dev lo down route add -net 127.0.0.0 netmask 255.0.0.0 dev lo # device: eth0 auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 192.22.189.58 netmask 255.255.255.248 gateway 192.22.189.57 broadcast 192.22.189.63 bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stp off post-up ip route add 192.22.189.59 dev br0 post-up ip route add 192.22.189.60 dev br0 post-up ip route add 192.22.189.61 dev br0 post-up ip route add 192.22.189.62 dev br0 -- /etc/lxc/vm3.conf lxc.utsname = vm3 lxc.rootfs = /var/lib/lxc/vm3/rootfs lxc.tty = 4 #lxc.pts = 1024 # pseudo tty instance for strict isolation lxc.network.type = veth lxc.network.flags = up lxc.network.link = br0 lxc.network.name = eth0 lxc.network.mtu = 1500 #lxc.cgroup.cpuset.cpus = 0 # security parameter lxc.cgroup.devices.deny = a # Deny all access to devices lxc.cgroup.devices.allow = c 1:3 rwm # dev/null lxc.cgroup.devices.allow = c 1:5 rwm # dev/zero lxc.cgroup.devices.allow = c 5:1 rwm # dev/console lxc.cgroup.devices.allow = c 5:0 rwm # dev/tty lxc.cgroup.devices.allow = c 4:0 rwm # dev/tty0 lxc.cgroup.devices.allow = c 4:1 rwm # dev/tty1 lxc.cgroup.devices.allow = c 4:2 rwm # dev/tty2 lxc.cgroup.devices.allow = c 1:9 rwm # dev/urandon lxc.cgroup.devices.allow = c 1:8 rwm # dev/random lxc.cgroup.devices.allow = c 136:* rwm # dev/pts/* lxc.cgroup.devices.allow = c 5:2 rwm # dev/pts/ptmx lxc.cgroup.devices.allow = c 254:0 rwm # rtc # mounts point lxc.mount.entry=proc /var/lib/lxc/vm3/rootfs/proc proc nodev,noexec,nosuid 0 0 lxc.mount.entry=devpts /var/lib/lxc/vm3/rootfs/dev/pts devpts defaults 0 0 lxc.mount.entry=sysfs /var/lib/lxc/vm3/rootfs/sys sysfs defaults 0 0

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• SQL 2008 - db mail issue

  - by Chris

  Hello. I have two instances of SQL Server 2008. One was upgraded from SQL Server 2000 and one was a clean, new install. The instances are running on different nodes of the same cluster, although I have tried having them both on the same node with identical results. SQL Mail operates perfectly on both instances. DB Mail operates perfectly on the newly installed instance. On the upgraded instance, DB Mail does not send any mail. Of course, I am not positive that the fact this instance is upgraded has anything to do with the issue, but it might. The configuration of my db mail profile and account looks identical to my functioning instance. In the configuration of the 'alerts' tab in the SQL Agent properties i have tried selecting both DB Mail and SQL Mail to no avail. Both instances use the same SMTP server with the same authentication (domain with db engine account). All messages sent via sp_send_db mail and those sent via the 'test email' option are visible in the sysmail_allitems queue and remain there as 'unsent'. The send_status eventually changes to 'failed'. The only messages in the sysmail_event_log are 'mail queue stopped by login domain\myuser', 'mail queue started by login domain/myuser' and 'activiation successful.'. selecting from the externalmailqueue has the same number of rows as sysmail_allitems. i have tried bouncing the agent, the entire instance and moving the other functioning instance to the other node in the cluster. any thoughts? thx.

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• Can't connect to research.microsoft.com on home Qwest DSL connection

  - by rakingleaves

  I have a puzzling issue regarding accessing research.microsoft.com from my home Qwest DSL connection. By default, I frequently get timeouts when accessing research.microsoft.com from Firefox, Safari, or Chrome on my Mac. I also cannot access the site from Internet Explorer in a Windows VM. However, I am able to access the site through proxify.com, so I know the site is not down. Furthermore, I haven't noticed problems accessing other sites (in particular, www.microsoft.com works fine). Also, I can access research.microsoft.com when I'm connected to networks other than my home Qwest DSL connection. Together, the above make me suspect a problem with either my router (Airport Express) or, more likely, my ISP. Anyone have any thoughts on how I can narrow down the problem further? I could call my ISP and tell them the above, but my feeling is that probably won't get me very far. I can get by browsing research.microsoft.com through a proxy, but it would be nice to figure out what's going on here and fix the problem. Oh, the only relevant discussion I found via Google was here: http://forums.whirlpool.net.au/forum-replies-archive.cfm/1311734.html Update: Thanks to those who have tried to help! I found one other thing while Googling that may be vaguely relevant: http://thedaneshproject.com/posts/supportmicrosoftcom-not-working-behind-squid/ Disabling the Accept-Encoding headers in Firefox actually didn't make a difference for me. I just thought the above might spark some other ideas about how mishandling of HTTP headers somewhere might be causing this problem. Thanks again! Another update: In case anyone is still thinking about this; I've found that I can't surf research.microsoft.com using the links text-based browser, but I can reliably download individual files with wget. Maybe that helps?

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• Dynamic subdomain routing

  - by Nader

  Hi everyone, I asked this question over at stackoverflow, but got very few views: http://stackoverflow.com/questions/2284917/route-web-requests-to-different-servers-based-on-subdomain Perhaps it's more applicable to this crowd. Here it is again for convenience: I have a platform where a user can create a new website using a subdomain. There will be thousands of these, eg abc.mydomain.com, def.mydomain.com . Hopefully if we are successful hundreds of thousands. I need to be able to route these domains to a different IPs to point at a particular app server. I have this mapping in a database right now. What are the best practices and recommended technologies here? I see a couple options: Have DNS setup with a wildcard CNAME entry so that all requests go to a single IP where perhaps two machines using heartbeat (for failover) know how to look up the IP in the database and then do an http redirect to the appropriate app server. This seems clunky and slow to me. Run my own DNS server that can be programatically managed such that when a new site is created a DNS entry is added. We also move sites around to different app servers, so I would need to be able to update DNS entries in close to real time. Thoughts anyone? Thanks. Update2: I've setup external wildcard DNS pointing at an HAProxy web server whose job it is to route requests to backend servers. The mapping is stored in our internal PowerDNS server. Question now is how to get the HAProxy server (or another) to use the value of the internal DNS and not some config file or access list? – Update: Based on some suggestions below, it seems like reverse-proxy server(s) is the way to go. As I'll be rebalancing the domain-server mapping, these need to work instantly and the TTL on a DNS solution could be a problem. Any recommendations on software to use considering this domain-IP data is stored in a DB, and I'll need this to be performant?

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• jdbc4 CommunicationsException

  - by letronje

  I have a machine running a java app talking to a mysql instance running on the same instance. the app uses jdbc4 drivers from mysql. I keep getting com.mysql.jdbc.exceptions.jdbc4.CommunicationsException at random times. Here is the whole message. Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was25899 milliseconds ago.The last packet sent successfully to the server was 25899 milliseconds ago, which is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. For mysql, the value of global 'wait_timeout' and 'interactive_timeout' is set to 3600 seconds and 'connect_timeout' is set to 60 secs. the wait timeout value is much higher than the 26 secs(25899 msecs). mentioned in the exception trace. I use dbcp for connection pooling and here is spring bean config for the datasource. <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource" > <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/db"/> <property name="username" value="xxx"/> <property name="password" value="xxx" /> <property name="poolPreparedStatements" value="false" /> <property name="maxActive" value="3" /> <property name="maxIdle" value="3" /> </bean> Any idea why this could be happening? Will using c3p0 solve the problem ?

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• Domino nchronos.exe multiple instances causing server to die, and Sametime problems

  - by Kevin

  I've had this problem for a few months now. I thought it started when I installed the Traveller software on the server to add ActiveSync support, but I removed that and the problem still persists. Basically new instances of "nchronos.exe" keeps spawning (and not ending), so over a period of a few days the server eventually gets drowned in nchronos.exe processes, stops responding and I need to kill Domino. My process count the last time was up at about 330, and when I killed it and restarted the Domino my process count went to 160. I'm running Domino 8.5.1 with Fix Pack 2. I don't know if it's relevant, but my Domino server was also acting as a Sametime server. At around the same time that nchronos started playing up sametime also stopped working. None of my users can connect to sametime and in the domino log it keeps telling me "stpolicy.exe" has terminated. I've googled for that and tried a few things, but nothing seems to make sametime work again. Any thoughts?? Cheers, Kevin

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• Process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process sending out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome.

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• With no password expire notification at logon in Windows 7, how are you configuring password expire

  - by J. L.

  To my understanding, Windows 7 users do not receive password expiration notification during the logon process - it occurs strictly from the system tray. We currently have tray balloon notifications disabled to lessen user distraction, and I expect the password change process is a smoother one during the logon process rather than in an existing session. As a result, users will get prompted to change their passwords at expiration. The users also connect to Terminal Services boxes, but receive the advanced notification for password expiration there. So, Windows 7 is not notifying, but TS/RDS and XP boxes are. Any guidance on configuring this? Personally, I would turn off all expiration notices, but I understand most users would prefer to see the notification. Thoughts? Any GPO or other settings I might be overlooking? The interactive logon setting below is already enabled for our Win7 workstation GPO. My thought is balloon notifications will get turned back on for Windows 7, but I wanted to see if anyone was aware of alternatives. Thanks. Computer Configuration\Windows Settings\Security Settings\Local Policies - Security Options Interactive logon: Prompt user to change password before expiration

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• Managing Linux Directory Permissions & SFTP

  - by Dizzle

  Good morning; I have a RHEL 5.7 web server configured to allow SSH/SFTP only by specific groups. I'd like for content managers to upload content to their respective directories and have that content inherit the user/group ownership of the directory regardless of upload method or application. For example: John is in group "web" for SSH/SFTP rights and "finance" for directory permissions, and uploads to directory "webstuff" via SFTP. Directory "webstuff" has permissions of "2760" (rwxrws---), and ownership of "apache:finance". If John uploads an update to an existing file in "webstuff", the ownership of the file stays at "apache:finance". If John uploads a new file to "webstuff", the ownership of the file is "john:finance". My desire is to have any file from John uploaded to "webstuff" to change to the directory's owner. I've tried with setuid and setgid both set, but the user-ownership didn't take. I've seen mentions on ServerFault of using ACL's, or a chrooted jail for SFTP but I have yet to configure and test them, and I don't know if they're a viable solution (they could be, I just don't know because I've never done either). Any thoughts and assistance would be greatly appreciated.

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• Why is my biometric logon method no longer default and how to fix it? Win 7-based lenovo laptop

  - by StormRyder

  My laptop has been having some random problems with hibernating properly. That is a whole another topic that I still haven't resolved, but this is a different issue. The issues are connected, I guess, because one time after my computer experienced a failed hibernate, my login screen changed: since then my login screen always appears as the standard one with a prompt to type in a password. I can still use the finger scanner by clicking "other credentials" button. But that's annoying having to do that every time; previously the prompt to use finger scanner was the default one, whereas the typing password access was the alternate. How do I bring this arrangement back? In other words, how to switch the default from the type password prompt to the finger scan prompt? From online searches, I have only found discussions of turning the biometric access on or off... but clearly it is turned on and working, since I can use it. It's just not the default for some reason...

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• Simulated NAT Traversal on Virtual Box

  - by Sumit Arora

  I have installed virtual box ( with Two virtual Adapters(NAT-type)) - Host (Ubuntu -10.10) - Guest-Opensuse-11.4 . Objective : Trying to simulate all four types of NAT as defined here : https://wiki.asterisk.org/wiki/display/TOP/NAT+Traversal+Testing Simulating the various kinds of NATs can be done using Linux iptables. In these examples, eth0 is the private network and eth1 is the public network. Full-cone iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source iptables -t nat -A PREROUTING -i eth0 -j DNAT --to-destination Restricted cone iptables -t nat POSTROUTING -o eth1 -p tcp -j SNAT --to-source iptables -t nat POSTROUTING -o eth1 -p udp -j SNAT --to-source iptables -t nat PREROUTING -i eth1 -p tcp -j DNAT --to-destination iptables -t nat PREROUTING -i eth1 -p udp -j DNAT --to-destination iptables -A INPUT -i eth1 -p tcp -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i eth1 -p udp -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -i eth1 -p tcp -m state --state NEW -j DROP iptables -A INPUT -i eth1 -p udp -m state --state NEW -j DROP Port-restricted cone iptables -t nat -A POSTROUTING -o eth0 -j SNAT --to-source Symmentric echo "1" /proc/sys/net/ipv4/ip_forward iptables --flush iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE --random iptables -A FORWARD -i eth1 -o eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT What I did : OpenSuse guest with Two Virtual adapters - eth0 and eth1 -- eth1 with address 10.0.3.15 /eth1:1 as 10.0.3.16 -- eth0 with address 10.0.2.15 now running stund(http://sourceforge.net/projects/stun/) client/server : Server eKimchi@linux-6j9k:~/sw/stun/stund ./server -v -h 10.0.3.15 -a 10.0.3.16 Client eKimchi@linux-6j9k:~/sw/stun/stund ./client -v 10.0.3.15 -i 10.0.2.15 On all Four Cases It is giving same results : test I = 1 test II = 1 test III = 1 test I(2) = 1 is nat = 0 mapped IP same = 1 hairpin = 1 preserver port = 1 Primary: Open Return value is 0x000001 Q-1 :Please let me know If any has ever done, It should behave like NAT as per description but nowhere it working as a NAT. Q-2: How NAT Implemented in Home routers (Usually Port Restricted), but those also pre-configured iptables rules and tuned Linux

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• Ubuntu 12.04 - HP ProLiant DL380 G4 - Load Maxes Out / Unresponsive

  - by Brian S

  Trying to post this question on here. I've posted it on the Ubuntu forums as well with no replies. Recently I upgraded an HP ProLiant DL380 G4 server from Ubuntu 10.04 server to Ubuntu 12.04 server. Upon doing so, the server will not - at random times - get to a load of 400+ and then become completely non-responsive. I use an SNMP graphing program (cacti) and the load steadily increases by about 10 every five minutes until it gets over 400 and the graphing stops. The graphs may not be accurate, but the CPU load averages about 3% before this happens - and right when the load starts increasing, it jumps to about 25% for 15 minutes and dramatically dips down to less than 1% (about 0.3%) until the graphing stops. I'm not able to open a SSH tunnel to the server to do anything. I've checked the /var/log/syslog and all logging stops at that time as well - with nothing else in there. The odd thing is - the server still responds to DNS queries for the zones it is authoritative on during this time - and at normal speed. Just not sure what the next step would be in order to find out what is going on - and how this issue can be corrected. The server cannot stay with Ubuntu 10.04 Server and needs to stay upgraded.

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• tcp msl timeout implementation in linux

  - by iamrohitbanga

  The following is given in the book TCP IP Illustrated by Stevens Quiet Time Concept The 2MSL wait provides protection against delayed segments from an earlier incarnation of a connection from being interpreted as part of a new connection that uses the same local and foreign IP addresses and port numbers. But this works only if a host with connections in the 2MSL wait does not crash. What if a host with ports in the 2MSL wait crashes, reboots within MSL seconds, and immediately establishes new connections using the same local and foreign IP addresses and port numbers corresponding to the local ports that were in the 2MSL wait before the crash? In this scenario, delayed segments from the connections that existed before the crash can be misinterpreted as belonging to the new connections created after the reboot. This can happen regardless of how the initial sequence number is chosen after the reboot. To protect against this scenario, RFC 793 states that TCP should not create any connections for MSL seconds after rebooting. This is called the quiet time Few implementations abide by this since most hosts take longer than MSL seconds to reboot after a crash. Do operating systems wait for 2MSL seconds now after a reboot before initiating a TCP connection. The boot times are also less these days. Although the ports and sequence numbers are random but is this wait implemented in Linux? Also RFC 793 says that this wait is not required if history is maintained. Does linux maintain any history of used sequence numbers for connections to handle this case?

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• open source solution to a gateway for a network of a housing cooperative of 150 people

  - by SirDinosaur

  i just inherited a barely functioning network for a student housing cooperative of about 150 people. in it's current state, as i understand it from the previous person in charge of the network, we have working wireless access points and working ethernet cords going to working gigabit switches going to a barely functioning gateway (right now a simple home router) to one of three possible outbound connections. it is possible to connect to the network through the wireless or ethernet, but especially during peak hours, packets / connections are likely dropped or otherwise get no response. my intuition tells me to replace the gateway with something that can handle multiple outbound connections (WAN) and one inbound connection (LAN), while the rest of the network seems suitable for now. i'm somewhat knowledgable in Linux (been using Debian after first Arch Linux) and i want to use as much open source as possible, but i'm confused whether or not a simple server that i could easily understand will work for this situation. do i need specialized hardware to handle the switching more effectively? if so, what are my options? (i found this, thoughts?) or if a Debian server would work, anything else i should about the specs required for this type of server? also links to any useful information on using open source to maintain this type of network would be most appreciated. <3 P.S. crossposted http://redd.it/yybp2.

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• Laptop Acer Travelmate 4050 takes over 10 Mins to POST

  - by Belliez

  Hi, I am a computer tech and have received a laptop for repair. I noticed when I turned it on the laptop would not do anything for a min or two (the fan would run up and stop, power led would shine and some cd rom activity then stop). It would sit there with a black screen. Suddenly after a random number of minutes (between 1-20mins!) the Acer BIOS screen would display and POST would happen before booting into Windows XP. It has frozen in XP at various times and pointed towards a CPU fault and over heating. The fan was on its last legs, sounded like a car engine, so I replaced this. Still same issues. I next replaced the CPU like for like. Same problems. Also applied new thermal paste between the cpu and heatsink, when running the fan kicks in occasionally (not as often as I thought it would) and I left it playing mp3, online radio and updating to service pack 3 and it wouldnt freeze. shutting down ok, cold start, not ok. Waits again before showing the BIOS screen. The hard disk was also making a screaming noise (SMART test and chkdsk passed) but I also replaced this. The laptop powers up with and without the battery so dont think its a battery issue. Running out of ideas and wondered if anyone had any advice. Thanks

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• Why Ubuntu could treat hosts file so strange?

  - by z4y4ts

  I have almost fresh Ubuntu desktop box. OS was installed two weeks ago and updated from karmic repositories. Last week I had no problems with DNS. But this week something had changed. I'm not sure what and when, and not sure whether I changed any configs. So now I have some really weird situation. According to logs name resolving should work normally. /etc/hosts 127.0.0.1 localhost test 127.0.1.1 desktop /etc/host.conf order hosts,bind multi on /etc/resolv.conf # Generated by NetworkManager search search servers obtained via DHCP nameserver 192.168.0.3 /etc/nsswitch.conf passwd: compat group: compat shadow: compat hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4 networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis But if fact it is not. user@test ~ping test PING localhost (127.0.0.1) 56(84) bytes of data. [skip] Pinging is ok. user@test ~host test test.myviacube.com has address xx.xxx.161.201 But pure I suspect that NetworkManager might cause this misbehavior, but don't know where to start to check it. Any thoughts, suggestions?

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• Suggestions on the best home server rack cabinet

  - by allentown

  I have a lot of gear in a colocation facility right now. Some of it is going to come home with me now. I do not know anything about the "rack mount" side of the industry. I lease a rack, and I put my stuff in it. I have a few 1U boxes, a few 2U boxes, and a few 4U boxes. 1U switch. One is a new Xserve, which means it is deep. I think I can get by with around 12U to 18U. I want to keep it as small as possible, since I do not have a lot of spare space at my home. I will not be able to bolt to the wall, floor etc, so it should not be tall. This is something I would love to more or less just be a box that sits on the floor but gives me the ability to mount nicely, do nice cable management etc. Are the "post" style racks junk? I am liking the open space, and the no limitations on depth of something like this: http://www.rackmountsolutions.net/images/products/Martin-relay-rack.jpg However, that thing is way too tall, and probably way too expensive. I am looking to be around $300.00 or less. More if I have to, though I would prefer not to. These look near perfect: (See comment for this link, the system will not let me post a second url) but I am worried the Xserve will not fit in it. If anyone has any good links, or website recommendations of good past experience, I would appreciate it. I am almost considering that I may be able to build something with random scraps of stuff at Home Depot as well.

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• How does Linux determine the SCSI address of a disk?

  - by Chris Sears

  Greetings, I'm working with RHEL 5.5 guest VMs under VMware ESX 4. When I configure the virtual disks in the VM hardware settings, each disk has a SCSI address in the format "N:M". For example, "1:3" would mean SCSI host number 1 and SCSI target ID 3. When I look at the disk info from the VM's BIOS or a Windows OS, the detected SCSI address info matches up with the virtual hardware settings. But under Linux, the SCSI address components don't match up, at least not completely or consistently. I've tried the three supported virtual SCSI and SAS drivers and they all seem to be "broken", but in different ways. Here's a list of the virtual hardware addresses vs what was detected under Linux with each of the drivers: Driver vHW Addr Linux Addr -------- -------- ---------- LSI SAS 0:0 0:0 LSI SAS 0:3 0:1 LSI SAS 0:6 0:2 LSI SCSI 1:1 2:1 LSI SCSI 1:4 2:4 LSI SCSI 1:7 2:7 pvSCSI 2:2 1:2 pvSCSI 2:5 1:5 pvSCSI 2:8 1:8 My main question is why does this happen under Linux? The next question is: how do I get it fixed or fix it myself? If I was going to guess, I'd say it's an issue with how the kernel is handing out the SCSI host number and how the Linux SCSI driver (included with VMware tools) is detecting the SCSI target number. Perhaps the order the drivers are loaded also has something to do with the issue. I'm guessing this would not involve udev, but I could be wrong. Any thoughts would be appreciated. Thanks! PS. My environment is VMware, but I don't need an answer for these drivers specifically. I imagine this might be a problem with any SCSI driver under Linux.

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• How to diagnose occasional sudden resets?

  - by steve314

  I have a Windows XP system, and have recently upgraded by adding 2 1GB sticks of RAM to the 2x0.5GB already present. Since then, about once per day (the system is used 8+ hours per day), the system has suddenly and unexpectedly reset. On a couple of occasions, the system has frozen completely, only responding to the power button being held in for several seconds to force power off. Nothing at all ever appears in the system event log that might indicate a possible cause - everything seems to suggest business as usual. Sounds like faulty memory - but memtest86+ says otherwise. A full test, taking over an hour, found no issues. The next likely suspicion, then, is that I've knocked something while installing the RAM. Trouble is, everything I can think of to test seems fine. I've opened up the case and prodded a few things around, hoping to get better contact on connections etc, but there's no sign yet as to whether that has made a difference or not. I thought about a malware-related timing fluke, but again, so far as I can tell I'm all clear. All I can think of to add to my checklist (mainly of things that I can't easily check) is... The power supply is (1) only 350W, (2) not necessarily the best quality, and (3) powering a Prescott P4 640 3.2GHz. Could that be borderline overloaded or about to die? How do I check? Is it possible that the CPU isn't getting cooled properly? I haven't had the fan past normal tickover even doing video encoding, and the only sane temperature reading from SpeedFan is pretty steady at 36 celcius, so probably not. Any thoughts? Is there a standard procedure for diagnosing this kind of fault?

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• Accessing Virtual Host from outside LAN

  - by Ray

  I'm setting up a web development platform that makes things as easy as possible to write and test all code on my local machine, and sync this with my web server. I setup several virtual hosts so that I can access my projects by typing in "project" instead of "localhost/project" as the URL. I also want to set this up so that I can access my projects from any network. I signed up for a DYNDNS URL that points to my computer's IP address. This worked great from anywhere before I setup the virtual hosts. Now when I try to access my projects by typing in my DYNDNS URL, I get the 403 Forbidden Error message, "You don't have permission to access / on this server." To setup my virtual hosts, I edited two files - hosts in the system32/drivers/etc folder, and httpd-vhosts.conf in the Apache folder of my WAMP installation. In the hosts file, I simply added the server name to associate with 127.0.0.1. I added the following to the http-vhosts.conf file: <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www/ladybug" ServerName ladybug ErrorLog "logs/your_own-error.log" CustomLog "logs/your_own-access.log" common </VirtualHost> <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot "c:/wamp/www" ServerName localhost ErrorLog "logs/localhost-error.log" CustomLog "logs/localhost-access.log" common </VirtualHost> Any idea why I can't access my projects from typing in my DYNDNS URL? Also, is it possible to setup virtual hosts so that when I type in http://projects from a random computer outside of my network, I access url.dyndns.info/projects (a.k.a. my WAMP projects on my home computer)? Help is much appreciated, thanks!

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• Four disks - RAID 10 or two mirrored pairs?

  - by ewwhite

  I have this discussion with developers quite often. The context is an application running in Linux that has a medium amount of disk I/O. The servers are HP ProLiant DL3x0 G6 with four disks of equal size @ 15k rpm, backed with a P410 controller and 512MB of battery or flash-based cache. There are two schools of thought here, and I wanted some feedback... 1). I'm of the mind that it makes sense to create an array containing all four disks set up in a RAID 10 (1+0) and partition as necessary. This gives the greatest headroom for growth, has the benefit of leveraging the higher spindle count and better fault-tolerance without degradation. 2). The developers think that it's better to have multiple RAID 1 pairs. One for the OS and one for the application data, citing that the spindle separation would reduce resource contention. However, this limits throughput by halving the number of drives and in this case, the OS doesn't really do much other than regular system logging. Additionally, the fact that we have the battery RAID cache and substantial RAM seems to negate the impact of disk latency... What are your thoughts?

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• "Error: Unknown error" when trying to start virtual machine from VMware server

  - by slhck

  Problem We are running VMware Server 2.0.0 build-116503 on a Ubuntu 10.04 LTS server. There is a virtual machine installed, running Lotus Domino on Windows Server 2003. Ever since a sudden power failure last week, the virtual machine won't properly start up. When I run the command: vmrun -T server -h https://127.0.0.1:8333/sdk -u root -p jk2x2208 start "[standard] lotus/test.vmx" … after 30 seconds it displays: Error: Unknown error That's about everything I get. I know the command is right, since that's what we've used all the time. This has happened last Saturday after a scheduled backup shutdown, and somehow I was able to start it again. This week, it happened again, and I can't get it back up. Occasionally, I also get: Error: Cannot connect to the virtual machine When I get this, and I run the start command, it seemingly works. Why is this so random? Which configuration could have been messed up? What I've tried / other info I already shut down VMware itself with /etc/init.d/vmware stop. This works. I tried to start VMware again with /etc/init.d/vmware start. It complains that it's "not configured", which is why I had to rm /etc/vmware/not_configured, and then try to start again. There have been no software updates on the machine, and no configuration changes

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• Multiple WAN interfaces on SonicWall TZ 100?

  - by Chad Decker

  I'm using a SonicWall TZ 100 with a basic configuration of X0 for the LAN and X1 for the WAN. The WAN uses DHCP to obtain its routable IP address. I want to obtain a second routable IP from my ISP. I'm in luck because my cable company will provide me with an additional dynamic IP for $5/mo. How do I bind this IP to my SonicWall? My additional dynamic IP will not be consecutive to the original one. It won't even be on the same class C. I think what I want to do is to use one of the empty ports/interfaces (X2, X3, or X4), tell that interface to use DHCP, and then add that interface to the WAN "zone". I can't figure out how to do this though. Here's what I've tried so far: (1) I've looked in Network Interfaces. I see X0 and X1 but the other unused interfaces don't show up. I don't see an "Add" button to add the new interfaces. (2) I've looked in Network Zones. I see that X0, X2, X3, X4 are in the LAN zone. I tried to drag X3 into the WAN zone but I can't. Nor does clicking the "Configure" button allow me to move an unused interface from LAN to WAN. (3) I've read the post entitled Splitting up multiple WAN's on Sonicwall. This doesn't seem applicable to me. Any thoughts?

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• DriveImage XML fails with a Windows Volume Shadow Service Error

  - by ssvarc

  I'm trying to image a SATA laptop hard drive, using DriveImageXML, that is attached to my computer via a USB adapter. I'm running Win7 Ultimate 64 bit. DriveXML is returning: Could not initialize Windows Volume Shadow Service (VSS). ERROR C:\Program Files (x86)\Runtime Software\Drivelmage XML\vss64.exe failed to start. ERROR TIMEOUT Make sure VSSVC.EXE is running in your task manager. Click Help for more information. VSSVC.EXE is running in Task Manager, as is VSS64.exe. Looking at the FAQ on the Runtime webpage this turned up: Please verify in Settings-Control Panel-Administrative Tools-Services that the following services are enabled: MS Software Shadow Copy Provider Volume Shadow Copy Also make sure you are able to stop and start these services. Possible reasons for VSS failures: For VSS to work, at least one volume in your computer must be NTFS. If you use only FAT drives, VSS will not function. The required NTFS volume does not need to be identical with the volume you want to image. You should make sure that VSSVC.EXE is running in your task manager. If the problems persist, registering "oleaut.dll" and "oleaut32.dll" using "regsvr32" might help. Both of those services are running and can be started and stopped without issue. Using "regsvr32" to register ""oleaut32.dll" returns successful, but "oleaut.dll" returns: The module "oleaut.dll" failed to load. Make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files. The specified module could not be found. Some other information that might be relevant. Browsing to the drive is successful, but accessing certain folders returns an "access" error. Windows runs a permissions adder that adds the current user profile to the NFTS permissions. Could this be the cause of the issue? DriveImage XML is running as Administrator. Thoughts?

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• Hosting django backend for iPhone / Android app

  - by Ashok Fernandez

  I am looking to make an iPhone / Android app for my university using the Appcelerator Titanium framework. The app will rely heavily on a server backend which will pull information from other sites, figuring out what is relevant to the user then deliver the content. Some of the information is individual to the user (calendar data), other bits are updates frequently but are shared (bus timetables) and others are static and the same for everyone (magazine articles). I was going to use django as I am fairly proficent in python so I thought it would save time. My question is, which hosting services do you recommend to host the server backend? I am expecting about 9000 people to use the app with very random spikes in traffic, but unfortunately I have very little to go on at this stage. I have heard a lot about Webfaction, is it suitable for something like this or am I likely to need something bigger? I don't really want to fork out for a VPS at this stage. What about Amazons EC2? Would that be more suitable than Webfaction? Sorry for the fairly open ended question, Im sort of new to this so I open to all suggestions.

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